I played META ages ago and the clue for the keyboard shortcuts to get to room 4 and to get the inventory items was mentioned in the readme file. I recently downloaded the game again and the newest version does not contain a readme. How is a new player meant to figure out the keys to press to get to room 4? I can't see any clue within the game itself.

That's a good point. Users of the AGS engine may know this because the keys are (intentionally) the same as there, but other people wouldn't. We'll have to make a new version that makes this clear, thanks for pointing that out.